<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let username=prompt('注册输入用户名')
    let password=prompt('请输入密码')
    if(username==='admin'&&password==='123456'){
        alert('登录成功')
        
    }else {
      alert('登录失败')
      
    }
    

  </script>
  
</body>
</html>